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Telegraph Communications
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TM-11-5820-919-12 Radio Set AN/PRC-104(A) (NSN
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Figure 3-1. Radio Set System Block Diagram


TM 11-5820-919-12
CHAPTER 3
THEORY OF OPERATION
contains the overall functional description of the radio set
3-1.
INTRODUCTION.
for transmit and receive operation, followed by a brief
description of each module.  It supports the operator's
and organizational  level  of  maintenance  for  unit
3-2.
This chapter contains the functional theory of
replacement.
Section II contains a functional block
operation of the radio set.  The information is provided
description of each of the seven radio set modules to
to enable the operators and organizational maintenance
provide a more detailed level of understanding of the
personnel to understand the overall function and
radio set operation.
capabilities  of  the  radio  set.
Section  I
SECTION I
OVERALL FUNCTIONAL DESCRIPTION
audio signals are routed through the control panel to the
3-3.
GENERAL.
modulator/demodulator.  The Xmt Audio mixes with the
three LO signals sent from the synthesizer to produce a
3-4.
This section describes the overall function of the
single sideband Xmt RF output. The low power Xmt RF
radio set, and discusses the transmit and receive
is amplified in the power amplifier and routed through the
operation at the module level.  It also briefly discusses
harmonic filter to remove transmitter harmonics.  The
the function of each module.
filtered Xmt RF is then applied to the antenna, via the
antenna tuner for impedance matching.
3-5.
RADIO SET FUNCTIONAL DESCRIPTION.
3-9.
RECEIVE OPERATION.
The Rcv RF signal
3-6.
The  radio set is a 2- thru 30-MHz single
from the antenna is routed back through the antenna
sideband (SSB) transceiver with a transmitter output of
tuner and is filtered by the harmonic filters to remove
20 watts.  Operation can be either voice, cw, or coded
spurious signals.
The Rcv RF is then routed to the
data (depending on the audio device used) with
modulator/demodulator where it mixes with the three LO
automatic antenna tuning.
There are three levels of
signals sent from the synthesizer to produce the Rcv
frequency conversion between audio and rf in both
Audio output. The Rcv Audio is then routed through the
transmit and receive with two stages of intermediate
control panel to the handset.
frequency (if.) amplification and filtering.  The radio set
consists of seven functional modules.
Five of the
3-10.  CONTROL  PANEL  (Figure  3-2).
The
modules are housed in the receiver/exciter unit:
receiver/exciter control panel provides operational control
of the radio set.  It couples voice or CW key from the
1.
Control Panel
audio devices in use by the operator, and has controls
2.
Synthesizer
for selection of frequency, volume, mode, and sideband
3.
Modulator/Demodulator
(SB), and illumination of frequency readouts. Frequency
4.
Harmonic Filter
Select and Sideband Select signals are routed to the
5.
Power Supply
synthesizer, and the Frequency Select signal also to the
antenna tuner. Filter Select signals are routed to the
3-7.
Two  functional modules are housed in the
harmonic filter. Volume control, mode select and Xmt
amplifier/coupler unit:
Audio are applied to, and Rcv Audio is received from, the
modulator/d -modulator. The control panel also
1.  Power amplifier
2.  Antenna tuner
3-8.
TRANSMIT OPERATION (Figure 3-1).
Input
3-1


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